Thesaurus

Synonyms for Ill-natured include:

abrasive, acerb, acerbic, acid, acrid, afflictive, annoying, atrabilious, awful, bad-tempered, beastly, bilious, bitter, blistering, bothersome, bristly, cantankerous, caustic, choleric, churlish, crabbed, crabby, cranky, cross, crotchety, crusty, curmudgeonly, currish, dark, disagreeable, displeasing, dour, dreadful, dyspeptic, embarrassing, forbidding, fractious, fussy, galling, glowering, glum, god-awful, grim, grouchy, gruff, grumpy, harsh, hellish, hot, hot-tempered, hotheaded, huffish, ill-humored, ill-humoured, ill-natured, ill-tempered, irascible, irritable, irritating, liverish, misanthropic, misanthropical, misogynous, moody, morose, mortifying, nagging, nasty, nerve-racking, nerve-wracking, nettlesome, offensive, ornery, painful, peckish, peevish, pesky, pestering, pestiferous, pettish, petulant, plaguey, plaguy, prickly, quick-tempered, rebarbative, repellant, repellent, rough, saturnine, scratchy, sharp, sharp-worded, shirty, short-tempered, shrewish, snappish, snappy, snorty, sore, sour, splenetic, spoiled, spoilt, stressful, sulfurous, sulky, sullen, sulphurous, surly, tart, teasing, techy, testy, tetchy, trying, ugly, ungrateful, unhappy, unpalatable, unpleasant, unsweet, venomous, vexatious, vexing, vinegarish, vinegary, virulent, vitriolic, waspish

ill-natured is a ADJ.